Pen



FIG. 1 is a perspective vie of the pen showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof; the left side elevational view is a mirror image of the right side elevational view;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings are for the purpose of illustrating unclaimed portions of the pen and form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 